GB-4
D
GB
F
NL
I
E
Maintenance
Replacing the UV tube
▷
▷
The UV tube in the UV sensor must be replaced
after approx. 10,000 operating hours (approx.
1 year) as its service life has expired (see “Ac-
cessories”).
1
Disconnect the system from the electrical power
supply.
2
Shut off the gas supply.
▷
▷
Do not touch the new UV tube with bare fingers.
4
5
6
3
7
Cleaning or replacing the quartz glass disc
2
3
4
1
5
Follow the reverse procedure when reassembling.
▷
▷
For a quartz glass lens, ensure that the lens cur-
vature points towards the flame.
Assistance in the event of
malfunction
WARNING
– Electric shocks can be fatal! Before working
on possible live components ensure the unit is
disconnected from the power supply!
– Fault-clearance must only be undertaken by
authorised, trained personnel!
– Unauthorised repairs on the UV sensor will
cancel our guarantee. Unauthorised repairs or
incorrect electrical connections can cause the
UV sensor to become defective. In this case
fail-safe operation can no longer be guaranteed!
– (Remote) resets may only be conducted by au-
thorised personnel with continuous monitoring
of the burner to be repaired.
– Safe operation only in conjunction with Elster
Kromschröder automatic burner control units,
flame detectors or burner control units.
•
Measure the current in the flame signal cable (con-
nect the positive pole of the measuring instrument
to the cable from the automatic burner control
unit and the negative pole to the cable from the
UV sensor).
▷
▷
The measured direct current must be greater than
1 µA (typically 20 µA).
UVS
1
2
3
PE
–
+
µA
Signal
? Fault
! Cause
• Remedy
Possible faults and suggested solutions
?
A direct current is flowing, but no flame present.
!
The UV sensor is influenced by the flames of other
burners, e.g. by reflection on the furnace walls.
•
Position the sensor so that it can only “view” its
own dedicated flame (e.g. use viewing tube).
!
Humidity inside the sensor.
•
Vent sensor.
!
The service life of the UV sensor has expired.
•
Replace UV tube in the UV sensor (see “Mainte-
nance”).
!
The sensitivity of the flame amplifier in the auto-
matic burner control unit is too high.
•
Adjust switching threshold on automatic burner
control units with adjustable switch-off threshold.
Tighten the
screw firmly.
